His name, Michael, literally means "Mīḵāʾēl," which translates to, "Who is like El?" "El" is one of many names for God, and it's where the name Elohim comes from too. So his name means, "Who is like God?" His name is the question he asked Lucifer when he said, "I will not serve God. I want to be like God." Michael said in reply, "Who is like God? No one can be Him but Him."
The flaming sword picture in the middle is also the sword of St. Michael. His sword is not always represented as flaming in every depiction of him, but it is definitely a symbol generally only used with him.
Some cool info on St. Michael:
His name, Michael, literally means "Mīḵāʾēl," which translates to, "Who is like El?" "El" is one of many names for God, and it's where the name Elohim comes from too. So his name means, "Who is like God?" His name is the question he asked Lucifer when he said, "I will not serve God. I want to be like God." Michael said in reply, "Who is like God? No one can be Him but Him."
The flaming sword picture in the middle is also the sword of St. Michael. His sword is not always represented as flaming in every depiction of him, but it is definitely a symbol generally only used with him.